<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"> <style>
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	</style></head><body><pre><span class='line'>  1</span> <span class="COMM">/**
<span class='line'>  2</span>  * Hilo
<span class='line'>  3</span>  * Copyright 2015 alibaba.com
<span class='line'>  4</span>  * Licensed under the MIT License
<span class='line'>  5</span>  */</span><span class="WHIT">
<span class='line'>  6</span> 
<span class='line'>  7</span> </span><span class="COMM">/**
<span class='line'>  8</span>  * @class Drawable是可绘制图像的包装。
<span class='line'>  9</span>  * @param {Object} properties 创建对象的属性参数。可包含此类所有可写属性。
<span class='line'> 10</span>  * @module hilo/view/Drawable
<span class='line'> 11</span>  * @requires hilo/core/Class
<span class='line'> 12</span>  * @requires hilo/util/util
<span class='line'> 13</span>  * @property {Object} image 要绘制的图像。即可被CanvasRenderingContext2D.drawImage使用的对象类型，可以是HTMLImageElement、HTMLCanvasElement、HTMLVideoElement等对象。
<span class='line'> 14</span>  * @property {array} rect 要绘制的图像的矩形区域。
<span class='line'> 15</span>  */</span><span class="WHIT">
<span class='line'> 16</span> </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">Drawable</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">Class.create</span><span class="PUNC">(</span><span class="COMM">/** @lends Drawable.prototype */</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 17</span> </span><span class="WHIT">    </span><span class="NAME">constructor</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="PUNC">(</span><span class="NAME">properties</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 18</span> </span><span class="WHIT">        </span><span class="NAME">this.init</span><span class="PUNC">(</span><span class="NAME">properties</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 19</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="PUNC">,</span><span class="WHIT">
<span class='line'> 20</span> 
<span class='line'> 21</span> </span><span class="WHIT">    </span><span class="NAME">image</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">,</span><span class="WHIT">
<span class='line'> 22</span> </span><span class="WHIT">    </span><span class="NAME">rect</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">,</span><span class="WHIT">
<span class='line'> 23</span> 
<span class='line'> 24</span> </span><span class="WHIT">    </span><span class="COMM">/**
<span class='line'> 25</span>      * 初始化可绘制对象。
<span class='line'> 26</span>      * @param {Object} properties 要初始化的属性。
<span class='line'> 27</span>      */</span><span class="WHIT">
<span class='line'> 28</span> </span><span class="WHIT">    </span><span class="NAME">init</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="PUNC">(</span><span class="NAME">properties</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 29</span> </span><span class="WHIT">        </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">me</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">this</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">oldImage</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">me.image</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 30</span> </span><span class="WHIT">        </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="NAME">Drawable.isDrawable</span><span class="PUNC">(</span><span class="NAME">properties</span><span class="PUNC">)</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 31</span> </span><span class="WHIT">            </span><span class="NAME">me.image</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">properties</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 32</span> </span><span class="WHIT">        </span><span class="PUNC">}</span><span class="KEYW">else</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 33</span> </span><span class="WHIT">            </span><span class="NAME">util.copy</span><span class="PUNC">(</span><span class="NAME">me</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">properties</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="KEYW">true</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 34</span> </span><span class="WHIT">        </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 35</span> 
<span class='line'> 36</span> </span><span class="WHIT">        </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">image</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">me.image</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 37</span> </span><span class="WHIT">        </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="KEYW">typeof</span><span class="WHIT"> </span><span class="NAME">image</span><span class="WHIT"> </span><span class="PUNC">===</span><span class="WHIT"> </span><span class="STRN">'string'</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 38</span> </span><span class="WHIT">            </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="NAME">oldImage</span><span class="WHIT"> </span><span class="PUNC">&&</span><span class="WHIT"> </span><span class="NAME">image</span><span class="WHIT"> </span><span class="PUNC">===</span><span class="WHIT"> </span><span class="NAME">oldImage.getAttribute</span><span class="PUNC">(</span><span class="STRN">'src'</span><span class="PUNC">)</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 39</span> </span><span class="WHIT">                </span><span class="NAME">image</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">me.image</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">oldImage</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 40</span> </span><span class="WHIT">            </span><span class="PUNC">}</span><span class="KEYW">else</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 41</span> </span><span class="WHIT">                </span><span class="NAME">me.image</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 42</span> </span><span class="WHIT">                </span><span class="COMM">//load image dynamically</span><span class="WHIT">
<span class='line'> 43</span> </span><span class="WHIT">                </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">img</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">new</span><span class="WHIT"> </span><span class="NAME">Image</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 44</span> </span><span class="WHIT">                </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="NAME">properties.crossOrigin</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 45</span> </span><span class="WHIT">                    </span><span class="NAME">img.crossOrigin</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="STRN">"Anonymous"</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 46</span> </span><span class="WHIT">                </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 47</span> </span><span class="WHIT">                </span><span class="NAME">img.onload</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 48</span> </span><span class="WHIT">                    </span><span class="NAME">img.onload</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 49</span> </span><span class="WHIT">                    </span><span class="NAME">me.init</span><span class="PUNC">(</span><span class="NAME">img</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 50</span> </span><span class="WHIT">                </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 51</span> </span><span class="WHIT">                </span><span class="NAME">img.src</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">image</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 52</span> </span><span class="WHIT">                </span><span class="KEYW">return</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 53</span> </span><span class="WHIT">            </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 54</span> </span><span class="WHIT">        </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 55</span> 
<span class='line'> 56</span> </span><span class="WHIT">        </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="NAME">image</span><span class="WHIT"> </span><span class="PUNC">&&</span><span class="WHIT"> </span><span class="PUNC">!</span><span class="NAME">me.rect</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="NAME">me.rect</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.width</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.height</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 57</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="PUNC">,</span><span class="WHIT">
<span class='line'> 58</span> 
<span class='line'> 59</span> </span><span class="WHIT">    </span><span class="NAME">Statics</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="COMM">/** @lends Drawable */</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 60</span> </span><span class="WHIT">        </span><span class="COMM">/**
<span class='line'> 61</span>          * 判断参数elem指定的元素是否可包装成Drawable对象。
<span class='line'> 62</span>          * @param {Object} elem 要测试的对象。
<span class='line'> 63</span>          * @return {Boolean} 如果是可包装成Drawable对象则返回true，否则为false。
<span class='line'> 64</span>          */</span><span class="WHIT">
<span class='line'> 65</span> </span><span class="WHIT">        </span><span class="NAME">isDrawable</span><span class="PUNC">:</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="PUNC">(</span><span class="NAME">elem</span><span class="PUNC">)</span><span class="PUNC">{</span><span class="WHIT">
<span class='line'> 66</span> </span><span class="WHIT">            </span><span class="KEYW">if</span><span class="PUNC">(</span><span class="PUNC">!</span><span class="NAME">elem</span><span class="WHIT"> </span><span class="PUNC">||</span><span class="WHIT"> </span><span class="PUNC">!</span><span class="NAME">elem.tagName</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="KEYW">false</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 67</span> </span><span class="WHIT">            </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">tagName</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">elem.tagName.toLowerCase</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 68</span> </span><span class="WHIT">            </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="NAME">tagName</span><span class="WHIT"> </span><span class="PUNC">===</span><span class="WHIT"> </span><span class="STRN">"img"</span><span class="WHIT"> </span><span class="PUNC">||</span><span class="WHIT"> </span><span class="NAME">tagName</span><span class="WHIT"> </span><span class="PUNC">===</span><span class="WHIT"> </span><span class="STRN">"canvas"</span><span class="WHIT"> </span><span class="PUNC">||</span><span class="WHIT"> </span><span class="NAME">tagName</span><span class="WHIT"> </span><span class="PUNC">===</span><span class="WHIT"> </span><span class="STRN">"video"</span><span class="PUNC">;</span><span class="WHIT">
<span class='line'> 69</span> </span><span class="WHIT">        </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 70</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
<span class='line'> 71</span> </span><span class="PUNC">}</span><span class="PUNC">)</span><span class="PUNC">;</span></pre></body></html>